watch their aggression -- by the way, including their precision guided weapons against hospitals in aleppo. the list goes on and onf the atrocities that have been committed by vladimir putin while we again try a reset. i've watched three presidents commit themselves to new relationship with vladimir putin. all three have been an abysmal failure. should we ignore the lessons of history in our relationship with vladimir putin and what should we be doing? >> chairman, history is not a straight jacket but i've never found a better guide for a way ahead by studying the history. since yalta, we have a long list of trying to deal with russia and we have a short list of success. we should recognize he's trying to break the north america eye lines and we take the diplomatic, military and alliance steps, working with our allies to defend ourselves where we must. >> you are a distinguished student of history and as we're all aware that following world war ii, a world order was established, which has held for basically the last 70 years. do you believe that that world order is now under more strain th